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HomeKey Engineering MaterialsKey Engineering Materials Vol. 778MOF Derived Catalysts for Oxygen Reduction...

MOF Derived Catalysts for Oxygen Reduction Reaction in Proton Exchange Membrane Fuel Cell

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Abstract:

Highly porous ZIF-67 (Zeolitic imidazole framework) has a conductive crystalline metal organic framework (MOF) structure which was served as a precursor and template for the preparation of nitrogen-doped carbon nanotubes (NCNTs) electrocatalysts. As a first step, the chloroplatinic acid, a platinum (Pt) precursor was infiltrated in ZIF-67 with a precise amount to obtain 0.12 mg.cm^-2 Pt loading. Later, the infiltrated structure was calcined at 700°C in Ar:H₂ (90:10 vol%) gas mixture. Multi-walled nitrogen-doped carbon nanotubes were grown on the surface of ZIF-67 crystals following thermal activation at 700°C. The resulting PtCo-NCNTs electrocatalysts were deposited on Nafion-212 solid electrolyte membrane by spray technique to study the oxygen reduction reaction (ORR) in the presence of H₂/O₂gases in a temperature range of 50-70°C. The present study elucidates the performance of nitrogen-doped carbon nanotubes ORR electrocatalysts derived from ZIF-67 and the effects of membrane electrode assembly (MEA) steaming on the performance of proton exchange membrane fuel cell (PEMFC) employing PtCo-NCNTs as ORR electrocatalysts. We observed that the peak power density at 70°C was 450 mW/cm²for steamed membrane electrode assembly (MEA) compared to 392 mW/cm² for an identical MEA without steaming.

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Periodical:

Key Engineering Materials (Volume 778)

Pages:

275-282

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.778.275

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Online since:

September 2018

Authors:

Noaman Khan*, Saher Saim, Xuan Shi, Muhammad Noman, Mujahid Wasim Durani, Asad Ali

Keywords:

Electrocatalysts, Metal Organic Frameworks, Nitrogen-Doped Carbon Nanotubes, Oxidation Reduction Reaction, PEMFC, Zeolitic Imidazole Frameworks

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